I'm having trouble even finding the right search terms to diagnose this problem. It's also hard to reproduce on my own machine.
When I enter a command in the terminal, occassionally I will see no results at all. I won't even see a new prompt. It seems like the display is getting corrupted. All it takes to clear it up is hitting
Enter again. Then I will see a (second) new prompt, and the result of the previous command.
A similar thing is happening in Emacs. When I switch to a buffer, or scroll, occassionally there are several missing lines, or even portions of lines. If I highlight those lines, they become visable again.
I'm not even sure what system controls rendering in both Emacs and Terminal. I don't notice the problem in any other applications (other than those, I mainly use Chrome).